207. TAXIWAYS AND TAXI ROUTES. Taxiways and taxi routes should be provided for the movement
of helicopters from one part of a landing facility to another. They provide a connecting path between the
FATO and a parking area. They also provide a maneuvering aisle within the parking area. A taxi
route includes the taxiway plus the appropriate clearances needed on both sides. The relationship
between a taxiway and a taxi route is illustrated in Figures
2-10, 2-11, and 2-12.
NOTE: At PPR heliports with no parking or refueling area outside the TLOFs, no taxi route or
taxiway is required.
a. TaxiwayTaxi Route Widths. The
dimensions of taxiways and taxi routes are a function of helicopter size, taxiwaytaxi route marking, and
type of taxi operations ground taxi versus hover taxi. These dimensions are defined in Table
2-2.
NOTE: Normally, the requirement for hover taxi dictates the taxiwaytaxi route widths. However,
when the fleet comprises a combination of large ground taxiing helicopters and smaller air taxiing
helicopters, the larger aircraft may dictate the taxiwaytaxi route widths. If wheel-equipped
helicopters taxi with wheels not touching the surface, the facility should be designed with hover taxiway
widths rather than ground taxiway widths.
b. Paved Taxiway Markings. The centerline
of a taxiway should be marked with a continuous 6- inch 15 cm yellow line. Both edges of the paved
portion of the taxiway should be marked with two continuous 6- inch wide 15 cm yellow lines spaced
6 inches 15 cm apart. Figure 2-10 illustrates taxiway centerline and edge markings.
c. Unpaved Taxiway Markings. The
centerline should be marked with in-ground flush markers. They should be longitudinally spaced at
approximately 15-feet 5 m intervals on straight segments and at approximately 10-feet 3
m intervals on curved segments. Edge markers should
also be used to provide strong visual cues to pilots. Edge markers may be either raised or in-ground flush
markers. They should also be longitudinally spaced at approximately 15-feet 5 m intervals on straight
segments and at approximately 10-feet 3
m intervals on curved segments. Figures 2-11 and 2-12
illustrate taxiway centerline and edge markings. 1 In-ground, flush centerline markers
should be yellow in color, 6 inches 15 cm wide, and approximately 5 feet 1.5 m long.
2 Raised-edge markers should be yellow- blue-yellow in color, 4 inches 10 cm in diameter,
and 10 inches 25
cm high, as illustrated in Figure 2-13.
3 In-ground, flush edge markers should be yellow in color, 12 inches 30 cm wide, and
approximately 5 feet 1.5 m long. NOTE: Where the visibility of the centerline
marking can not be guaranteed at all times, such as locations where snow or dust commonly obscure the
centerline marking and it is not practical to remove it, centerline marking is still recommended.
However, under such circumstances, the minimum taxiwaytaxi route dimensions should be determined
as if there was no centerline marking see Table 2-2. NOTE: Elevated centerline markers are NOT
recommended because they present an obstruction hazard.
d. Raised Edge Markers in Grassy Areas.
Raised edge markers are sometimes obscured by tall grass. The heliport operator should address this
problem with a 12-inch diameter 30 cm diameter concrete pad or a solid material disk around the pole
supporting the raised marker, as illustrated in Figure 2-13.
e. Taxiway to Parking Position Transition Requirements. Taxiway centerline markings should
continue into parking positions and become the parking position centerlines. However, if the parking
position has centerline marking and the taxiway does not, the parking position centerline should be
extended, in the direction of the taxiway, for a distance of at least one half of the rotor diameter of
the largest helicopter for which the parking position is designed.
f. Surfaces. Ground taxiways should have a
surface that is Portland Cement, asphalt or a surface, such as turf, stabilized in accordance with the
recommendations of Item P-217 of AC 1505370-10. Unpaved portions of taxiways and taxi routes should
have a turf cover or be treated in some way to prevent dirt and debris from being raised by a taxiing
helicopter’s rotor wash.
g. Gradients. Recommended taxiway and taxi
route gradients are defined in Chapter 8. 20
h. Lighting. See paragraph 210. 208. HELICOPTER PARKING. If more than one
helicopter at a time is expected at a heliport, the facility should have an area designated for parking
helicopters. The size of this area should depend on the number and size of helicopters to be
accommodated. Parking positions should be `designed to accommodate the full range of
helicopter size and weights expected at the facility. Parking positions should support the static loads of
the helicopter intended to use the parking area Paragraph 806a. Parking areas may be designed as
one large, paved apron or as individual, paved parking positions.
a. Location. Aircraft parking areas should not
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